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Radius = Diameter ÷ 2
= 22/7 × 7²
= 154 dm²
2. Luas Lingkaran = 3,14 × r²
= 3,14 × 40²
= 3,14 × 1.600
= 5.024 cm²
3. Luas Lingkaran = 22/7 × r²
Jari-jari = Diameter ÷ 2
= 22/7 × 3,5²
= 38,5 cm²